fix(db): use libsql in prepare mode with cloudflare preset

[onmax]

WIP
Closes #791

Summary

PR #775 fixed dev mode but missed prepare mode. nuxt prepare runs with dev=false, _prepare=true → D1 driver selected → fails locally with "DB binding not found".

StackBlitz

	Link	Expected
Bug	nuxthub-791	❌ DB binding not found
Fix	nuxthub-791-fixed	✅ Dev server starts

CLI Reproduction

git clone --depth 1 --filter=blob:none --sparse https://github.com/onmax/repros.git
cd repros && git sparse-checkout set nuxthub-791
cd nuxthub-791 && pnpm i && pnpm dev

Verify fix

git sparse-checkout add nuxthub-791-fixed
cd ../nuxthub-791-fixed && pnpm i && pnpm dev

The -fixed folder uses pnpm patch to apply the fix locally.

Related

• [Question] DevTools integration lost in v0.10? Database and Blob panels not working with SQLite (D1) #772 / PR fix(db): use libsql in dev mode when cloudflare preset is set #775: Original fix added && !nuxt.options.dev
• nitro preset 'cloudflare-module' #791: Same bug but during prepare mode

[vercel]

@onmax is attempting to deploy a commit to the NuxtLabs Team on Vercel.

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxthub/core@798

commit: ef80b78

[onmax]

Closing: fix included in #797